<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>Document</title>
    </head>
    <body>
        <div id="app">
            <button-counter></button-counter>
            <button-counter></button-counter>
            <button-counter></button-counter>
        </div>
        <script src="./lib/vue.js"></script>
        <script>
            Vue.component('button-counter', {
                data: function() {
                    return {
                        count: 0
                    };
                },
                template: '<button v-on:click="handle"> 点击了 {{ count }}次 .</button>',
                methods: {
                    handle: function() {
                        this.count += 2;
                    }
                }
            });
            var app = new Vue({
                el: '#app',
                data: {}
            });
        </script>
    </body>
</html>
